I am using lenovo Y510 series laptop.my web cam is not working.when i open the cam it is said that the web cam is using in some other programs. please solve my problems cam not working

You need to re-install your webcam driver.
-first uninstall the web cam driver you are currently using to do this follow these steps:
-go to start, control panel, programs and features then look for the driver of your cam, click un-install).
-restart machine
-download the driver of your webcam from www.lenovo.com/support. type in on the search bar Y510 drivers then look for the webcam driver
-install webcam driver and test it

First install a missing driver, you can download it from the laptop manufacturer website if you don't have the software for it!

for Example if the webcam is from Dell/Toshiba/Acer then visit Dell/Toshiba/Acer/Lenovo website...

First uninstall the older device drivers and then install the latest device drivers. You can also download the latest webcam drivers from the internet and install the new device drivers.

Now go to manufacture site & in the download option, select your model number.

After selecting the laptop model number from site, click on 'Software & Drivers Downloads'.

Now you need to choose your operating system & select the given updates & follow all instructions to download it.

After complete download, install supported driver for your laptop webcam. After install driver, reboot your laptop again and check that your webcam is working properly or not.

I hope it will fix your webcam not working issue if laptop is not facing any hardware issue.

Feel free to get technical assistance for troubleshoot Lenovo laptop/desktop/notebook at http://www.vtechsquad.com/lenovo-support/

For anyone confused since there is no webcam for windows 7 option, you can use the vista option on the lenovo drivers site - link here to save time:

http://consumersupport.lenovo.com/uk/en/DriversDownloads/drivers_list.aspx?CategoryID=12